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Real Estate Securities - Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Total Realized Gains on Sales and Calls of AFS Securities, net $ 10,686 $ 9,363
Sales    
Debt Securities, Available-for-sale [Line Items]    
Gross realized losses 6,660 9,363
Calls    
Debt Securities, Available-for-sale [Line Items]    
Gross realized losses $ 4,026 $ 0